A cluster of ring-ditches, the circular earthwork remnants of ancient burial mounds, came to light in a drone aerial image captured on 9 November 2021. The mounds themselves, known as barrows, have long since been flattened by centuries of agriculture, but the ditches that once ringed them survive as crop marks or soil discolouration, legible only from above. What the plough destroys on the surface, it sometimes inadvertently preserves in the subsoil.

The ring-ditches at Knockbrack form part of a recorded barrow cemetery, catalogued in the Sites and Monuments Record as DU004-012. Barrow cemeteries are groupings of prehistoric burial mounds, often dating to the Bronze Age, where communities interred their dead across generations, sometimes over centuries, creating landscapes that were as much about memory and territorial identity as about individual burial. The Knockbrack examples sit within a large tillage field, and their survival as detectable features beneath the topsoil, even after sustained cultivation, points to the depth and scale of the original earthworks. The aerial image was taken by Ian Lennon and the record was compiled by Caimin O'Brien, with the entry uploaded to the Sites and Monuments Record in July 2023.

The site is not accessible as a formal visitor destination, and there is nothing visible at ground level; the ring-ditches are strictly a feature of the aerial view, invisible to anyone walking the field margin. The value here lies in what the image represents rather than what the ground currently shows. For anyone interested in crop-mark archaeology or aerial survey work in Ireland, the Knockbrack drone image is a useful illustration of how much can persist beneath apparently featureless farmland. Those curious about the broader barrow cemetery can consult the National Monuments Service map viewer, where DU004-012 is listed with associated records, and where the aerial photograph itself can be viewed.